Buy the buyer. I've even acted as the middleman/courier for two people on watch purchases granted one was a friend!
I recall
almost shipping a Rolex to a trusted seller via FedEx and the amount of insurance I required (over $5k iirc) required the package to be inspected by the shipper.
I wasn't comfortable with that practice being that everyone working there looked fresh out of high school so I left and shipped with USPS instead.
The practice doesn't guarantee a Rolex nor did I understand how the person inspecting the package could appraise such a piece, but it does insure that you're not sending $5000+ of packing peanuts in a small box.
I like the idea of taking a short smartphone video if it's allowed